Pass rate
95.4%
Above average — 4.2 pts ahead of the 91.2% that cars this age and mileage manage.
Across 457 recorded tests.
Typical repair bill £45–£119
2021 Porsche 718 Cayman GT4 MOT pass rate
- 2021
- typical 9,679 mi
Most common fault
Tyres
53.2% of faults · 19.8% nationally
mostly tread below the limit, cuts and sidewall bulges.
Which year to buy
- Best 2019 98.0% pass
- Avoid 2021 95.4% pass · this year
Across the 4 years on record, a spread of 2.6 points. See every year →
- First-attempt pass
- 95.2%
- Typical mileage
- 10k mi
The 2021 Porsche 718 Cayman GT4 MOT pass rate is 95.4% of its MOT tests — 4.2 points ahead of what its age and mileage predict. Tyres is the biggest single reason it fails, at 53.2% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how Porsche 718 Cayman GT4 does in your corner of the country.
Expert verdict
Tyres: 2.7× the national share
Tyres make up 53.2% of everything recorded on the 2021 Porsche 718 Cayman Gt4, against 19.8% nationally — 33.4 points above. Check all four tyres yourself, including the inner shoulders, and look at the date stamp — a tyre can pass on tread and still be six years old.
- Beats its own age and mileage. Once you allow for how old and how far these cars have been driven, the expected pass rate is 91.2% and this one manages 95.4% — 4.2 points ahead of what its age and mileage predict.
- When it fails, it costs. Only 0% of this model’s typical repairs come in under £30 in parts — the failures here tend to be the kind that need a garage rather than a bulb.
Written from this page's own figures: fault shares against the national composition, the like-for-like pass rate, and the priced repair list. How these are worked out
Watching a Porsche 718 Cayman GT4? Get an email when these numbers change .
How does the 2021 Porsche 718 Cayman GT4 compare?
Cars of this age and mileage average 91.2%, so this figure is 4.2 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 95.2%. The median 2021 Porsche 718 Cayman GT4 in this dataset had covered 9,679 mi.
Pass rates also shift with the test month: tests recorded October–March passed 95.4% of the time, April–September 95.4%.
The single most recorded failure item is "Has a cut in excess of the requirements deep enough to reach the ply or cords", noted on 2.19% of tests.
- 457 recorded tests behind this page.
- 95.4% overall pass rate, 95.2% on a first attempt.
- Across every year of the Porsche 718 Cayman GT4, the average is 96.8% — best year 2019 (98.0%), worst 2021 (95.4%).
Figures count every completed test on this vehicle-year in the dataset, including retests. See methodology for the exact definition.
This page's data
- Tests analysed
- 457
- Typical mileage (median)
- 9,679 mi
- Make and model
- Porsche 718 Cayman GT4
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Tyres
Usually a DIY or independent-garage job.
Does mileage affect the 718 Cayman GT4 MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 87% so small gaps stay visible.
Regional pass rates for the 718 Cayman GT4
| Region | Tests | Pass rate |
|---|---|---|
| South East | 106 | 97.2% |
| East of England | 52 | 94.2% |
| East Midlands | 49 | 95.9% |
| North West | 46 | 97.8% |
| Yorkshire | 45 | 95.6% |
| Scotland | 40 | 95.0% |
| South West | 39 | 89.7% |
| West Midlands | 28 | 96.4% |
| London | 22 | 90.9% |
| North East | 19 | 94.7% |
Regions come from the postcode area recorded at the test station. Areas on region borders are assigned to the region with the majority of their population.
What fails a 2021 718 Cayman GT4
Everything a tester recorded on this vehicle, grouped into the inspection sections that produced it. The notch on each bar is the national share, so you can see at a glance whether this car is unusual or just ordinary.
A test can record several items, so these percentages do not add up to 100%. The exact strings, with prices, are in the full DVSA record at the bottom of this page.
Before your test
Three checks worth doing on a 2021 718 Cayman GT4
These are not generic tips — they are the faults recorded most often on this exact model, rewritten as things you can check yourself. All three take about ten minutes and cost nothing.
-
Check the number plates 0.7% of tests
“registration plates does not conform to the specified requirements”
Check both plates are present, legible and correctly spaced, with the postcode of the supplier and the BS AU 145e mark. A private plate in the wrong style is a fail before the car is even looked at.
-
Check the windscreen 0.7% of tests
“windscreen damaged”
Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.
-
Check the exhaust and emissions 0.2% of tests
“exhaust system noise is clearly in excess of that emitted by a similar vehicle fitted with a standard silencer in…”
Listen for a blow at idle and have someone rev it gently. Then look at the tailpipe smoke: blue is oil, white when warm is coolant, black is over-fuelling. Any of those and the emissions test is the least of it.
Shares are the proportion of tests on this vehicle that recorded the item, so they overlap: one test can record several.
What it costs to get a 2021 718 Cayman GT4 through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £45–£119 — and 0% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £45–£119
- Cheapest common item: registration plates does not conform to the…
- £20–£80
- Dearest common item: other emission control equipment missing…
- £60–£250
- Common items a careful owner can do at home
- 40%
- Repairs that still cost under £30
- 0%
Estimates from typical UK parts prices, weighted by how often each item appears in 457 MOT tests on this vehicle. They exclude diagnostics, retest fees and garage labour where the part is a DIY fit, and they are not figures from the DVSA dataset. Older and higher-mileage examples cost more than the average. How these estimates are built → · All MOT repair costs → · Cheapest cars to put through a test →
Every year of the 718 Cayman GT4, side by side
4 model years on record, from 2019 to 2022. Across them the pass rate runs from 95.4% to 98.0% — a spread of 2.6 points. The bar under each year is the item that failed it most often.
- 2019 98.0% headlamp aim projected beam image…
- 2020 97.4% windscreen damaged but not…
- 2021 95.4%has a cut in excess of the…
- 2022 95.8% has a cut in excess of the…
Colour is the pass rate on a fixed scale, so a block means the same thing on any model. Each year links to its own page with the full fault breakdown.
Compare the 2021 Porsche 718 Cayman GT4 with another year
The raw pass rate mostly measures age. The year comparison adds the like-for-like figure, the mileage bands and the repair bill.
Other 2021 cars with a similar record
- Suzuki SX4 S-Cross 95.4%
- Toyota YARIS 95.3%
- Kia Stonic GT-Line 95.6%
- Volvo XC40 Inscription Pro 95.2%
- Toyota RAV4 95.1%
- Toyota YARIS Dynamic 95.1%
Closest pass rates among 2021 cars with at least 2,000 tests, so a small sample cannot flatter itself into the list. See the full rankings: best and worst MOT pass rates.
The full DVSA record for the 2021 Porsche 718 Cayman GT4 10 failure items · 6 advisories · 10 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 77 individual items recorded on this vehicle, and the same share across all cars nationally. A single test can record several items, so a row is not a percentage of tests.
| Category | Items | This car | Nationally | Difference |
|---|---|---|---|---|
| Tyres | 41 | 53.20% | 19.76% | +33.44 |
| Non-component advisories | 9 | 11.70% | 4.18% | +7.52 |
| Identification of the vehicle | 9 | 11.70% | 1.76% | +9.94 |
| Brakes | 5 | 6.50% | 20.89% | −14.39 |
| Visibility | 4 | 5.20% | 4.97% | +0.23 |
| Suspension | 2 | 2.60% | 20.98% | −18.38 |
| Lamps, reflectors and electrical equipment | 2 | 2.60% | 12.21% | −9.61 |
| Body, chassis, structure | 2 | 2.60% | 5.57% | −2.97 |
| Noise, emissions and leaks | 2 | 2.60% | 5.52% | −2.92 |
| Road Wheels | 1 | 1.30% | 0.75% | +0.55 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Has a cut in excess of the requirements deep enough to reach the ply or cords Tyres | Major | 2.2% | £45–95 |
| Registration plates does not conform to the specified requirements Identification of the vehicle | Major | 0.66% | £20–80 |
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 0.66% | £80–200 |
| Exhaust system noise is clearly in excess of that emitted by a similar vehicle fitted with a standard silencer in… Body, chassis, structure | Major | 0.22% | £45–120 |
| Has ply or cords exposed Tyres | Major | 0.22% | £45–95 |
| Headlamp aim too high Lamps, reflectors and electrical equipment | Rectified | 0.22% | £30–80 |
| Headlamp aim too high Lamps, reflectors and electrical equipment | Major | 0.22% | £30–80 |
| Other emission control equipment missing where fitted as standard Noise, emissions and leaks | Major | 0.22% | £60–250 |
| Particulate filter missing where one was fitted as standard Noise, emissions and leaks | Major | 0.22% | £60–250 |
| Registration plates does not conform to the specified requirements Identification of the vehicle | Rectified | 0.22% | £20–80 |
Severity is as recorded: Major and Dangerous fail the test outright; Minor and Advisory do not. Costs are estimates from typical UK parts prices — see how they are built.
What testers noted without failing the car
Advisories are the early warnings — the same parts a year or two before they fail. Reading them is how you tell a car that has been maintained from one that has been patched.
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Tread depth below requirements of 1.6mm Tyres | Advisory | 3.3% | £45–95 |
| Non-component advisories Nail in tyre Non-component advisories | Advisory | 1.8% | £45–95 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 1.5% | £45–95 |
| Has a cut in excess of the requirements deep enough to reach the ply or cords Tyres | Advisory | 0.88% | £45–95 |
| Tread depth tread pattern not visible over the whole tread area when minimum depth required is 1.0mm Tyres | Advisory | 0.66% | £45–95 |
| Badly distorted Road Wheels | Advisory | 0.22% | £20–55 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 450 | 95.3% | 10,833 mi |
| 30-60k | 6 | 100.0% | 35,157 mi |
Source: 457 recorded tests on this vehicle-year. Every row above is recomputed from the same DVSA extract as the rest of the page — see the methodology.
2021 718 Cayman GT4 MOT questions
What is the MOT pass rate for a 2021 Porsche 718 Cayman GT4?
95.4% of the 457 2021 Porsche 718 Cayman GT4 tests in this dataset passed, against a national average of 91.2% for cars first used in 2021. First-attempt pass rate: 95.2%.
What are the most common MOT failures on a 2021 Porsche 718 Cayman GT4?
The three most recorded items are has a cut in excess of the requirements deep enough to reach the ply or cords (2.19%), registration plates does not conform to the specified requirements (0.66%), windscreen damaged but not adversely affecting driver's view (0.66%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2021 Porsche 718 Cayman GT4 MOT pass rate?
Yes. Cars under 30,000 miles passed 95.3% of the time, falling to 100.0% for those over 120,000 miles. The median 2021 Porsche 718 Cayman GT4 in this dataset had covered 9,679 mi.
Does the season affect the 2021 Porsche 718 Cayman GT4 MOT pass rate?
Tests recorded in the winter months (October–March) passed 95.4% of the time; summer months (April–September) passed 95.4%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.